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Small Engine Comparison
Engine
2GM20F
3GM30F
Atomic 4
Atomic 4
HP
18
27
30
30
Reduction
2.6:1
2.6:1
1:1
2:1
Weight pounds
251
304
330
345
Width in.
19.0
17.91
19.31
19.31
Length in.
25.60
29.33
26.6
32.68
Height in.
22.32
22.32
19.31
19.31
Height above prop shaft in.
18.38
18.58
13.125
14.16
Electric
12v
12v
12v
12v
Prop size
14 x 13
15 x 14
12 x 10
14 x 10
Number of blades
3
3
2
2
Optional reduction
2.21:1
2.36:1
Prop size for optional reduction 3 blade
13 x 11
14 x 13
         
Large Engine Comparison
 
Yanmar Diesel
GM Gas
Engine
4LHA-STE
6PLA-DTE
6LPA-STE
350
454
Horsepower
230
250
300
350
454
Weight w/gear in pounds
932
942
1044
870
1025
Bobtail weight in pounds
827
837
899
741
871
Bobtail length in.
28.5
35.5
35.5
26.0
29.5
Length w/gear in.
41.69
47.4
47.4
50.5
53.6
Width in.
26.6
26.4
26.4
27.5
31.8
Height in.
28.46
28.7
29.1
30.36
32.0
Height above crank shaft in.
19.0
19.37
19.75
19.6
20.75
Height above prop shaft in.
24.6
25.0
25.4
19.6
20.75
         
Yanmar transmission ZF 63A
GM transmission Warner 72 series w/reduction
Yanmar is easily adapted to Mercruiser Bravo Drives